SPECIAL TYPES OF INTERVAL VALUED NEUTROSOPHIC GRAPHS M. A. MALIK1 , A. HASSAN2 Abstract. Neutrosophic theory has many applications in graph theory, interval valued neutrosophic graph (IVNG) is the generalization of fuzzy graph, intuitionistic fuzzy graph and single valued neutrosophic graph. In this paper, we introduced some types of IVNGs, which are subdivision IVNGs, middle IVNGs, total IVNGs and interval valued neutrosophic line graphs (IVNLGs), also discussed the isomorphism, co weak isomorphism and weak isomorphism properties of subdivision IVNGs, middle IVNGs, total IVNGs and IVNLGs. Keywords: Interval valued neutrosophic line graph, Subdivision IVNG, middle IVNG, total IVNG.
1. Introduction Neutrosopic sets were introduced by Smarandache in [1], which are the generalization of fuzzy sets and intuitionistic fuzzy sets. The single valued neutrosophic graphs were introduced by Broumi, Talea, Bakali and Smarandache in [3] and recently in [8, 9, 10] proposed some algorithms. A graph is a way to represent information between objects. The objects are represented by vertices and the relations by edges. When there is vagueness in the description of the objects or in its relationships or in both, it is natural that we need to design a fuzzy graph Model. The perception of fuzzy graph was introduced by Rosenfeld in [6] and the some remarks on fuzzy graphs were explained by Bhattacharya in [5]. The special types and its truncations of fuzzy graphs were paid the way by Gani in [7]. The IVNGs have many applications in path problems, networks and computer science. The strong IVNG and complete IVNG are the special types of IVNG. In this paper, we introduce the another types of IVNGs, which are subdivision IVNGs, middle IVNGs, total IVNGs and IVNLGs. These are all the strong IVNGs, also we discuss their relations based on isomorphism, co weak isomorphism and weak isomorphism. 2. Preliminaries Let G denotes IVNG and G∗ = (V, E) denotes its underlying crisp graph. 1
Department of Mathematics, University of the Punjab, Quaid-e-Azam Campus, Lahore-54590, Pakistan. e-mail: malikpu@yahoo.com ;
2
alihassan.iiui.math@gmail.com; . 1